Machines



F. SPOEHR.

Mechanism for Operating the Feeding Wheel in Sewing Machines. No.101,779. Patented April 12, I870.

u. PETERS. PMo-Liihugraphlr. Wnnlnginn. o. c,

IMPROVEMENT IN MECHANISM FOR FRIEDRICH SPOEHR, OF PHILADELPHIA,PENNSYLVANIA.

Letters Patent No. 101,7 7 9, dated April 12, 1870.

OPERATING THE FEEDING-WHEEL IN SE WING- MACHINES.

The Schedule referred to in these Letters Patent and making part or thesame To all whom it may' concern Be it known that [,FRIEDRICH SPOEHB, ofthe. city and county of Philadelphia and State of Pennsylvania, haveinvented certain new and useful Im-- provements in the Feed-motion ofSewing-lVI-achin'es; and I do hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe accompanying sheet of drawings, and,

to the letters of reference marked thereon, in which- Figure l is aperspective view; Figure 2 is a front View; and Figure 3 is a back view.Similar letters refer to similar parts in the several views.

A is the feed-wheel of a sewing-machine. Turning independently on itshub, by means of suitable mechanism, is a driver, constructed andoperated as follows:

A driving-piece, B, which turns independently on the hub O of thefeed-wheel, has" a crank-end, D, and

an adjusting holding-down plate, E,'on opposite ends. The crank-end isjointed to a shoe-feed lever, F,

by an intermediate lever, G, forming such an angle that the act-ion ofthe crank on it will not be lost.

The'shoe-lever has the shoes H I on opposite sides of the flange act thefeed-w heel, fig. Their surfaces of contact exactly coincide withtheinner and outer surfaces of the flange. They are confined in theirrelative positions beneath the shoe and feedlever, and receive itsmotion by meansof the downwardly-projecting pins 0 (I, which take intosuitable openings in the shoes.

The shoe-lever is prevented from lifting by. the setscrews e f of theend E of the driving-piece B.

When the driving-piece B is turned on the hub of the feed-wheel in thedirection of the arrow g, the intermediate connecting-lever Gr forces orpushes the shoe and feed-lever F and its shoes around the flange a ofthe feed-wheel, which is accomplished without theshoes pinching theflange; but when it is turned in the direction of the arrow h, theintermediate counecting-lever pulls the shoe and feed-lever after it,which tilts its lower end and causes the shoes to firmly bite or presson the flange (I, and carry the feed-wheelin the same direction.

The feed-wheel of a sewing machine must necessarily have an intermittentrotary motion. It .will be readily seen that the driver-mechanismproduces the same when vibrated respectively in the direction of thearrows g h.

v The wear of the shoes against the flange a, is taken up by means of abolt, '1, and spiral spring m, placed in a suitable opening in' the endE of the driver B as they wear, the spring forces the bolt against thepro- 'jectiou H of the shoe and feed-lever, which increases the distancebetween the end E and the said projection, and also increases the angle11,, formed by the shoe-feed lever and the intermediateconnecting-leverG, which causes a greater tilt in the shoe-lever when turning in thedirection of the'a-rrow h.

What I claim as my invention, and desire to secureby Letters Patent, isp1'; The feed-wheel A, driving-piece B, shoe and feed-lever F,'shoes H I,and the intermittent lever G, when constructed and arrangedsubstantially as shown.

2. The driving-piece B, in combination with the bolt 1), spring an, shoeand feed-leyer F, shoes H I, and the pins 0 d, as shown. v

In testimony whereof I hereunto sign my name to this specification inpresence of two subscribing witnesses.

' FRIEDRICH SPOEHR. Witnesses:

FRANCIS D. PASTORIUS, WILLruM BRoscn.

